Dan G
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Location: New Castle, KY
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 skybolt
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   Topic: Skybolt Flying Wire Tension
Posted: Nov/25/2007 at 18:25 |
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New to forum. Have a Skybolt project and have installed the wings. hopefully for the last time. The question is regarding flying wire tension. Does anyone out there have information regarding correct tension for the flying/landing wires. All I have is Hale's building guide that says a 50lb. pull in the middle of the wire should yield 1 1/4" to 1 1/2" deflection. I would be curious to know what tension that equals in lbs. I do have access to a real tensiometer but it is marked for Stearman wires, not in lbs. I can cross reference if I know what tension I am looking for. As I have them currently adjusted, I am right at 1 3/8" on the landing wires, but about 1 3/4" on the flying wires. The wings are where I want them, and I hate to change anything if that tension will be OK. Any ideas? Thanks. Dan G.
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Neil
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Joined: Nov/10/2006
Location: Monroe, LA
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Acro Sport II
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Posted: Nov/26/2007 at 21:25 |
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I'm guessing that you are pretty close. Its hard to get a good answer on wire tension. On Acro Sport IIs a 50# pull gives close to 2" on the front pair of wires and a little less on the rear flying wires. The two airplanes differ greatly in their rigging as it is straight wing vs. swept and 4 flying wires per side vs. 3. Also the Skybolt doesn't have a center section so the landing wires are probably a lot longer. I wouldn't think you would want to be much tighter. I'm really surprised no one has posted. Anything in the site manual that compares with the Hale Wallace numbers?
Edited by Neil - Nov/26/2007 at 21:35
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Dan G
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Location: New Castle, KY
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skybolt
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Posted: Nov/27/2007 at 01:29 |
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Thanks for the response Neil. I do think I am close to where it should be, I am just looking for more evidence as such. I keep playing phone tag with Steen Aero, hopefully I will find someone there with a definitive answer. If I find something out, I will post the info. Dan G.
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jgnunn
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Skybolt S. IO-360 200HP
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Posted: Dec/27/2007 at 18:32 |
Any new info on this anyone?
There is a brief mention on this in the old Skybolt Newsletters:
'states between 600 and 750 pounds with a tensionometer.
Edited by jgnunn - Dec/15/2009 at 11:18
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John'Beej'Nunn Blog Skybolt S 200HP. Always go the extra mile. The road won't be crowded...
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Dan G
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Location: New Castle, KY
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skybolt
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Posted: Dec/30/2007 at 01:45 |
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Thanks for digging that up. Dan G
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trident13184
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Location: Fallon, NV
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Skybolt
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Posted: Jul/08/2010 at 18:45 |
Steen Skybolt forum experts,
I am conducting my condition inspection and I decided to check my wing's flying wire tension since I had a a lot of vibration in flight on one wire (turns out there was only 200 pounds of tension on that wire). Using a recently purchased set of plans from Steen, in the building manual, it says flying wire tension is set by using a scale to achieve a 30# pull, and at mid-wire span, that should yield a 1 1/2 inch deflection of the wire.
I bought a flying wire tension-meter from A/C Spruce (the one that uses a torque wrench) and measured the same wire that gave a 1 1/2 inch deflection at 30 pounds of pull and the tensionmeter showed a tension of 325#.
Reading the PDF of the Skybolt newsletter, there is a reference to adjusting the tension so there "is no vibration in flight" and that should give you a tension between 600-750 pounds.
Just for reference, I have 5/16" Brunton streamlined wires.
Thoughts?
Randy B.
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Trident 131
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wunnabe
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Location: Mequon Wisconsin
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Building a Skybolt
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Posted: Jul/15/2010 at 14:48 |
The force vector formula is T=(F x L)/4D where T = tension in the wire, F = the deflection force, L = the length of the wire, D = the deflection distance.
So for a 100" wire, pulled to a deflection of 1.5", with a force (fish scale reading) of 30#, the tension in the wire would be 500#
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Jim Kidd
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